package com.emm.yixun.common.utils;

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.URL;
import java.net.URLConnection;
import java.nio.charset.Charset;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;

import org.apache.commons.lang.StringUtils;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.HttpClientBuilder;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;

import com.alibaba.fastjson.JSONObject;

/**
 * http请求
 * 
 * @author junze.liu
 */
public class HttpApi {
	
	/**
	 * 调用非固定地址
	 * 
	 * @param url 接口url
	 * @param data json入参
	 * @return json
	 */
	public static String doPostUrl(String url, JSONObject data) {
		String result = null;
		HttpClient client = HttpClientBuilder.create().build();
		HttpPost httpPost = null;
		try {
			httpPost = new HttpPost(url);
			List<NameValuePair> params = new ArrayList<NameValuePair>();
			JSONObject json = new JSONObject();
			json.put("params", data);
			params.add(new BasicNameValuePair("body", json.toString()));
			UrlEncodedFormEntity entity = new UrlEncodedFormEntity(params, "UTF-8");
			httpPost.setEntity(entity);
			HttpResponse response = client.execute(httpPost);
			if (response != null) {
				HttpEntity resEntity = response.getEntity();
				if (resEntity != null) {
					result = EntityUtils.toString(resEntity, "UTF-8");
				}
			}
		} catch (Exception e) {
			e.printStackTrace();
		}
		return result;
	}
	
	/**
	 * 调用非固定地址
	 * 
	 * @param url 接口url
	 * @param data json入参
	 * @return json
	 */
	public static String doPost(String url, String jsonBody) {
		String result = null;
		HttpClient client = HttpClientBuilder.create().build();
		HttpPost httpPost = null;
		try {
			httpPost = new HttpPost(url);
			httpPost.setHeader("Content-Type", "application/json;charset=UTF-8");
			StringEntity se = new StringEntity(jsonBody, Charset.forName("UTF-8"));
			se.setContentType("application/json");
			httpPost.setEntity(se);
			HttpResponse response = client.execute(httpPost);
			if (response != null) {
				HttpEntity resEntity = response.getEntity();
				if (resEntity != null) {
					result = EntityUtils.toString(resEntity, "UTF-8");
				}
			}
		} catch (Exception e) {
			e.printStackTrace();
		}
		return result;
	}
	
	/**
	 * get请求
	 * @param url
	 * @param param
	 * @param contentType 编码格式
	 * @return
	 */
	public static String sendGet(String url, String param, String contentType) {
		String result = "";
		BufferedReader in = null;
		try {
			//当编码格式为空时，默认为GBK
			if(StringUtils.isBlank(contentType)) {
				contentType = "GBK";
			}
			String urlNameString = url + "?" + param;
			URL realUrl = new URL(urlNameString);
			// 打开和URL之间的连接
			URLConnection connection = realUrl.openConnection();
			// 设置通用的请求属性
			connection.setRequestProperty("accept", "*/*");
			connection.setRequestProperty("connection", "Keep-Alive");
			connection.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
			// 建立实际的连接
			connection.connect();
			// 获取所有响应头字段
			Map<String, List<String>> map = connection.getHeaderFields();
			// 遍历所有的响应头字段
//			for (String key : map.keySet()) {
//				System.out.println(key + "--->" + map.get(key));
//			}
			// 定义 BufferedReader输入流来读取URL的响应
			in = new BufferedReader(new InputStreamReader(connection.getInputStream(), contentType));
			String line;
			while ((line = in.readLine()) != null) {
				result += line;
			}
		} catch (Exception e) {
			System.out.println("发送GET请求出现异常！" + e);
			e.printStackTrace();
		}
		// 使用finally块来关闭输入流
		finally {
			try {
				if (in != null) {
					in.close();
				}
			} catch (Exception e2) {
				e2.printStackTrace();
			}
		}
		return result;
	}
}
